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in the making
Following R-Packages were used for the data processing and analysis:
Data used for this project was provided from the module supervisors. Used was a dataset of wild boar locations with time stamps (Table 1; wildschwein_BE), a set with the location of the scare offs (Table 2; schreck_location) and a third set including the data when the scare offs were on/off with additional information about parameter settings. (Table 3; schreck_agenda). The wild boar location was sampled in 15 min intervals while for the scare off events we have data of the date of on/off but no further time information. The scare off settings can be adjusted for two different modes (standard v1 and aggressive v2), volume (a range of 33 - 100), interval (12.5 - 30), max. and min. orientation (0-330).
Table 1: Wild boar location data
| TierID | TierName | CollarID | DatetimeUTC | E | N | day | moonilumination |
|---|---|---|---|---|---|---|---|
| 1 | Ueli | 12272 | 2014-05-28 21:01:14 | 2570390 | 1204820 | Tag | 0.0033556 |
| 1 | Ueli | 12272 | 2014-05-28 21:15:18 | 2570389 | 1204826 | Abenddaemmerung | 0.0033556 |
| 1 | Ueli | 12272 | 2014-05-28 21:30:13 | 2570391 | 1204821 | Abenddaemmerung | 0.0033556 |
| 1 | Ueli | 12272 | 2014-05-28 21:45:11 | 2570388 | 1204826 | Abenddaemmerung | 0.0033556 |
| 1 | Ueli | 12272 | 2014-05-28 22:00:33 | 2570388 | 1204819 | 1Nachtviertel | 0.0033556 |
| 1 | Ueli | 12272 | 2014-05-28 22:15:16 | 2570384 | 1204828 | 1Nachtviertel | 0.0033556 |
Table 2: Scare off location data
| id | region | flurname | kultur | installationshohe | zaun | jagddruck | lat | lon |
|---|---|---|---|---|---|---|---|---|
| WSS_2014_01 | elfingen | rüti | weizen&hafer | 1.80 | nein | mittel | 47.51406 | 8.095919 |
| WSS_2014_02 | elfingen | steiacher | weizen | 1.95 | nein | mittel | 47.49951 | 8.122986 |
| WSS_2014_03 | elfingen | schlotterbode | weizen&sorgungras | 1.80 | nein | mittel | 47.50564 | 8.110089 |
| WSS_2014_04 | fanel | tannenhof | kartoffeln&mais | 1.80 | ja | gering | 46.99720 | 7.056506 |
| WSS_2014_05 | fanel | tannenhof | karotten&kartoffeln | 1.80 | nein | gering | 46.99433 | 7.058764 |
| WSS_2014_06 | fanel | fanelacher | kartoffeln&mais&zuckerrueben | 1.80 | nein | gering | 47.01424 | 7.039208 |
Table 3: Scare off on/off, interval and parameter data
| id | datum_on | datum_off | modus | lautstaerke | intervall | ausrichtung_min | ausrichtung_max | phase |
|---|---|---|---|---|---|---|---|---|
| WSS_2014_01 | 2014-04-01 | 2014-06-20 | standard v1 | 100 | 15 | 80 | 280 | 2 |
| WSS_2014_01 | 2014-07-23 | 2014-09-19 | standard v1 | 100 | 15 | 80 | 280 | 2 |
| WSS_2014_02 | 2014-04-26 | 2014-08-08 | standard v1 | 50 | 4 | 45 | 225 | 2 |
| WSS_2014_03 | 2014-04-26 | 2014-08-08 | standard v1 | 100 | 15 | 30 | 180 | 2 |
| WSS_2014_03 | 2014-09-19 | 2014-10-18 | standard v1 | 50 | 20 | 30 | 180 | 2 |
| WSS_2014_04 | 2014-05-01 | 2014-10-28 | standard v1 | 33 | 15 | 200 | 280 | 2 |
The data was filtered for the relevant areas and time periods. As a first step, only wild boar location data within the area of the scare offs was considered. Therefore, the data frames were transformed to sf objects to then be visually investigated (Figure 1) and then cropped to the relevant area (Figure 2).
Figure 1: Wild boar locations (blue) and scare off locations
(red) uncropped
Figure 2: Wild boar locations (blue) and scare off locations
(red) cropped
Secondly, the data frames of the scare off data was joined to one data
frame and afterwards filtered according to the time when wild boar data
was available. After filtering 7 relevant scare offs remain. Those are
listed in Table 4. In order to be able to rule out the
possibility that the scare offs influenced someone one anothers data, in
terms of wild boar occurrence, we examined the distances of the scare
offs, as shown in Figure 3. Although scare off 2015_04 and
2016_06 are very close to each other (a few meter), they were active in
different years. Therefore, we assumed there is no mutual influence in
terms of wild boar scare off. However, for the statistical approaches we
had to neglect two additonal scare offs. WSS_2016_06 provides only 7 GPS
points within a scare off duration of 30 with 10 days before and 14 days
after event and WSS_2016_03 was active only for 5 days which is not
comparable to the other events.
Table 4: Scare offs active within wild boar sampling period
| id | datum_on | datum_off | geometry |
|---|---|---|---|
| WSS_2015_01 | 2015-05-20 | 2015-07-01 | POINT (2570864 1205214) |
| WSS_2015_03 | 2015-05-22 | 2015-07-01 | POINT (2569685 1207155) |
| WSS_2015_04 | 2015-05-27 | 2015-07-01 | POINT (2570247 1206737) |
| WSS_2016_01 | 2016-04-04 | 2016-04-23 | POINT (2570699 1203282) |
| WSS_2016_05 | 2016-06-15 | 2016-07-15 | POINT (2574315 1204308) |
| WSS_2016_06 | 2016-06-15 | 2016-07-15 | POINT (2570344 1206741) |
| WSS_2016_13 | 2016-09-29 | 2016-10-04 | POINT (2570951 1205843) |
Figure 3: Scare off location overlap
## Data Analysis for Research Question 1 To get an impression if the
scare offs influences the occurrence of wild boars and how is the range
of the effect, we designed a function. The function
draw_density_plot(schreck_id, radii, days_before, days_after)
is used to filter the data by observation radius and time for one scare
off to then plot it as a density function. Thereby, the time period of
days before and after the event can be set, while the time period during
the event is given by the scare off agenda.
The wild boar occurence shows different patterns for each scare off event ( Figure 3). The number of GPS point for each event ranges from 178 (WSS_2016_05) to above 10’000 points (WSS_2016_05). For WSS_2015_01, WSS_2015_03, and WSS_2015_04 we observe the contrary pattern of what we expected, the occurrence increases during the first half of the event and then begins to decrease. The occurrence change is very similar when considering 100m, 200m or 400m radius. However the amplitude decreases with larger radius. WSS_2016_01 and WSS_2016_05 follow more the expected pattern, but the difference of the number of GPS points is high. For those scare off we observe higher amplitudes for smaller radius. While for WSS_2016_05 the size of the radius has low impact on the observation, it has a great impact in for WSS_2016_01 observation. In a further step of exploratory data analysis we created interactive maps for two scare off events: one with the expected results (Map 2) and on with the opposite results (Map 2).
Figure 3: Density plots for each scare off event, 10 days before
and 14 days after event
Map 1: Wild boar location of WSS_2015_01 scare off, 10 days before, during, and 14 days after event
Map 2: Wild boar location of WSS_2016_01 scare off, 10 days before, during, and 14 days after event
To be continued # Discussion coming soon